Crop & Pest Report

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Scout for Colorado Potato Beetles (06/23/16)

Adult Colorado potato beetles are emerging from overwintering sites.

Scout for Colorado Potato Beetles

Adult Colorado potato beetles are emerging from overwintering sites. The adult is 3/8 inch long, with oval body and a yellow-brown with 5 black stripes on each wing cover. The orange eggs are laid on the underside of leaves in clusters of 10 to 30. Larvae are 1/8 to 3/8 inch long and brick red to light orange. Both adults and larvae feed on potato foliage.

The economic threshold is to initiate treatment at 15 to 30 percent egg hatch. Best results have been achieved by flagging the first egg masses that can be located and monitoring these daily.

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Janet J. Knodel

Extension Entomologist

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